<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .big{
            width:800px;
            height:500px;
            border:1px solid red;
            margin:0 auto;
        }
        .header,.title,.footer{
            width:700px;
            height:50px;
            margin:20px auto;
            border:1px solid yellow;
        }
        .content{
            width:700px;
            height:250px;
            margin:20px auto;
            border:1px solid blue;
        }
    </style>
</head>
<body>
   <div class="big">
       <div class="header"></div>
       <div class="title"></div>
       <div class="content"></div>
       <div class="footer"></div>
   </div>
</body>
</html>